March 23rd, 2021 at 2:00 pm - 5:00 pm

2021 Water Environment Federation Collections Conference (Virtual)


Tuesday, March 23, 2021
3:00 PM – 4:00 PM Eastern

CIPP in Paradise — Large Diameter Gravity Interceptor Sewer Rehabilitation by Lining with UV Cured-in-Place Pipe
Presentation by Ron Abraham, Ken Stewart, Amanda Dobbs, Michael Burgett, Gresham Smith; Kenneth Rekdahl, Dueñas, Camacho and Associates

During this presentation, representatives from Gresham Smith and Dueñas, Camacho and Associates will discuss the progressive design-build effort funded by the U.S. Department of Defense to design and implement trenchless improvements to approximately 45,000 linear feet – over eight miles – of large diameter gravity interceptor sewer line as part of the Guam Waterworks Authority (GWA) Refurbishment Project in the Northern District.

The existing sewer infrastructure serving the northern part of Guam, including Andersen Air Force Base (AAFB) and Finegayan, and conveys wastewater to the Northern District Wastewater Treatment Plant. Due to its age, the system was experiencing failures and blockages that were causing groundwater infiltration and inflow and ultimately compromising the integrity of the sewer line. The rehabilitation was required correct those issues and to support DoD’s new Marine Corps base, Camp Blaz, which is currently under construction.

Leveraging extensive sewer rehabilitation design experience, the Gresham Smith team used a topographic survey of the project area, geographic information system (GIS) data, closed-circuit television video and software generated reports to provide comprehensive designs. The final design solution included epoxy coating the interior of manholes and rehabilitating 18- to 42-inch sewer lines using ultraviolet (UV) light cured-in-place-pipe (CIPP), a process that requires minimal water, which is a vital resource for Guam. The improvements restored the structural integrity of the sewer system, maintaining  conveyance and protecting Guam’s groundwater supply.